JP3825770B2 - Method and apparatus for recording / inspecting servo information in a disk drive - Google Patents

Description

  The present invention relates to a disk drive control method and apparatus, and more particularly to recording servo information while minimizing the influence on the servo information recorded in the adjacent cylinder by the gap erase field in the disk drive, and corresponding servo information inspection. Further, the present invention relates to a servo information recording / inspection method and apparatus for a disk drive for performing defect processing.

  The hard disk drive includes a plurality of magnetic transducers that can record / reproduce information by sensing and magnetizing the magnetic field of each of the rotating single or plural disks. This information is typically formatted in a plurality of sectors located within the annular track. There is a track number located across each surface of the disc. The number of vertically similar tracks is sometimes referred to as a cylinder. Therefore, each track shall be defined by a cylinder number.

  Each transducer is integrated into a slider that is typically incorporated into a head gimbal assembly (hereinafter abbreviated as HGA). Each HGA is attached to the actuator arm. The actuator arm has a voice coil positioned adjacent to a magnetic assembly that together identifies a voice coil motor (hereinafter abbreviated as VCM). A hard disk drive typically includes a drive circuit and a controller that supply a current that excites the VCM. The excited VCM rotates the actuator arm to move the transducer across the disk surface.

  When recording / reproducing information, the hard disk drive may perform a seek routine to move the transducer from one cylinder to another. During the seek routine, the VCM is excited by a current that moves the transducer from the disk surface to a new cylinder position. The controller also performs a servo routine that ensures that the transducer is moved to the correct cylinder position and track center.

  The converter is composed of a writer part for recording data and a reader part for recording data. In the recording mode, as shown in FIGS. 1A and 1B, a current is passed through the lighters POLE1 and POLE2 to form a magnetic field and magnetize the disk.

  If a magnetic field is formed between POLE 1 and POLE 2, an undesired gap erase field is additionally generated as shown in FIGS. 1A and 1B, and this causes a TPI (Tracks-Per) in the high-density recording apparatus. As -Inch) increases, it has a greater effect on adjacent cylinders.

  In a general servo track write process, servo information is recorded on the disk while increasing the cylinder number sequentially from the cylinder number 0 of OD (Outer Direction) to the last cylinder number of ID (Inner Direction). By the way, as the head (converter) is positioned at OD, MD (Middle Direction), and ID, the central axes of POLE1 and POLE2 and the cylinder generate positive skew, zero skew, and negative skew, respectively.

  As shown in FIG. 1B, when servo information is recorded in the Nth cylinder in the skew “0” direction from the OD, the central axes of POLE1 and POLE2 generate cylinders and positive skew. Due to such a positive skew phenomenon, an additionally generated gap erase field affects the N + 1 cylinder. However, since servo information is not yet recorded in the (N + 1) th cylinder and servo information is recorded in the (N + 1) th cylinder after recording the servo information in the (N + 1) th cylinder, from the OD to the point where the skew is “0”, The gap erase field does not affect the servo information of the adjacent field.

  However, as shown in FIG. 1A, the axes of POLE1 and POLE2 begin to have a cylinder and a negative skew past the point where the skew is “0”. This affects the servo information recorded in the (N-1) th cylinder when the gap erase field is recording the servo information of the Nth cylinder. Since the influence of the gap erase field results in narrowing the width of the already used signal, the servo signal size is drastically reduced in the cylinder after the skew “0” than before. The downsizing of the servo signal is sensitive to noise, and there is a problem that normal servo control operation is not performed by being converted into an incorrect cylinder value or PES (Position Error Signal) value during A / D conversion.

  In order to improve the problems as described above, servo information is recorded in the radial direction from one of the inner peripheral side and the outer peripheral side so as to be less affected by the erase width, and the skew of the recording head is almost “0”. A technique is disclosed in which servo information is recorded in the radial direction from the other direction on the inner or outer peripheral side by being changed in the intermediate region (see, for example, Patent Document 1).

JP 2001-189062 A

  However, according to the technique described in Patent Document 1, as shown in FIG. 6, the servo data is superimposed on the track in the intermediate area where the servo data recording direction is changed depending on the accuracy of the servo track writer. Although the phenomenon of recording occurs, there is a problem that servo data is recorded abnormally in such a superimposed recording area. In addition, servo data inspection and track defect processing must be performed in the area where servo data is superimposed and recorded depending on the accuracy of the servo writer, but such technology has not been developed yet, and patent literature There was a limit in applying the technology described in 1 to products.

  Therefore, the present invention has been made in view of such problems, and an object of the present invention is to provide a point where the skew is “0” from the OD in order to minimize the influence of the skew when recording servo information of the disk drive. Servo information recording / inspection method in a disk drive for recording servo information in the opposite direction from the ID to the point of skew “0”, and inspecting the servo information and performing defect processing accordingly, An apparatus, a defect processing method, and an apparatus thereof are provided.

In order to solve the above-described problem, according to an aspect of the present invention, there is provided a servo information recording method in a disk drive, in which the skew is “0” from the outer periphery in the outsider region centering on the cylinder having the skew “0”. Servo information is sequentially recorded in a certain cylinder direction, and in the insider area, a recording process in which servo information is sequentially recorded from the inner circumference to the cylinder direction having a skew of “0”, and the predetermined distance is at least the precision of the push pin that moves the head the a distance determined based on, after finishing the recording of the servo information by the recording process, inspect the servo information recorded from the cylinder having skew '0' to the cylinder in the predetermined distance, the servo information recording an inspection step of conditions to determine whether it is normal, the recording from the cylinder having skew '0' to the cylinder in the predetermined distance If an error occurs in the inspection result of the servo information, the servo information is recorded again by feeding back to the recording process. If no error occurs, the cylinder within the predetermined distance from the cylinder having the skew “0” is recorded. characterized in that a and a processing step of processing the track defect, the servo information recording / inspection method in the disk drive is provided.

In order to solve the above problems, according to another aspect of the present invention, there is provided a servo information recording method in a disk drive, in which servo information is sequentially recorded from a cylinder having the smallest number to a cylinder having a skew of “0”. After recording to the cylinder having the skew “0”, the servo process is sequentially recorded from the cylinder having the largest number to the cylinder having the skew “0”. and other recording step, a predetermined distance is a distance determined based on the accuracy of the push pins for moving at least the head, after performing the above other recording step, the predetermined distance from the cylinder having skew '0' Check the servo information recorded on a certain cylinder, the inspection process servo information recording state it is determined whether a normal, skew the inspection process " If there is an error in the inspection result of the servo information recorded in the cylinder at the predetermined distance from the cylinder that is "", the servo information is recorded again by feeding back to one recording process. , And a process of performing track defect processing on a cylinder within the predetermined distance from a cylinder having a skew of “0”, a servo information recording / inspection method in a disk drive is provided.

In order to solve the above problems, according to another aspect of the present invention, there is provided a servo information recording / inspection method in a disk drive, in which a recording process for recording servo information in a cylinder and a cylinder number are increased. However, the inspection process for inspecting the servo information recorded in the cylinder and the predetermined distance is a distance determined based on at least the accuracy of the push pin that moves the head, and if an error occurs as a result of the servo information inspection, a determining step of the cylinder number in which the error has occurred to determine whether the appropriate section cylinder having skew '0' to the cylinder in the predetermined distance, the cylinder number is skew '0 the determination result errors occur in the determination step when the cylinder is a "corresponds to the cylinder in the predetermined distance, feedback to the recording process for a new recording servo information Otherwise, when the cylinder in which the error occurred corresponds to the maximum number cylinder in the feedback process that feeds back to the recording process after performing the track defect process and the cylinder in which the servo information is inspected in the inspection process. , characterized in that it comprises a processing step of processing the track defect cylinder within the predetermined distance from the cylinder having skew '0', the servo information recording / inspection method in the disk drive is provided.

Furthermore, in order to solve the above-mentioned problem, according to another aspect of the present invention, a disk drive to which a servo information recording / inspection method is applied, a disk having a surface, a spindle motor for rotating the disk, , A converter capable of recording / reproducing information on a disk, a VCM that moves the converter, and a cylinder that controls this VCM and has a skew of “0” at the time of servo information recording. Servo information is sequentially recorded in the cylinder direction with the skew “0”, and in the insider area, the converter is controlled so that the servo information is sequentially recorded in the cylinder direction with the skew “0” from the inner circumference, and the servo information is recorded. After finishing, the servo information recorded on the cylinder at a predetermined distance from the cylinder with skew “0” is inspected, and the servo information record And a controller for performing a process to determine whether it is normal, the predetermined distance is a distance determined based on the accuracy of the push pins for moving at least the head, the controller, the servo information cylinder In the first process for inspecting servo information recorded in the cylinder while increasing the cylinder number, and when an error occurs as a result of the servo information inspection in the first process, the cylinder number in which the error has occurred is A second process for determining whether or not the cylinder is at a predetermined distance from a cylinder with a skew “0”, and a cylinder with an error in the determination result of the second process from a cylinder with a skew “0” If the cylinder is located at the above distance, servo information is newly recorded. Otherwise, an error occurs. A third process that feeds back the first cylinder after track defect processing to the first process, and a cylinder that has a skew of “0” when the cylinder whose servo information has been checked in the first process corresponds to the maximum number cylinder. A disk drive is provided that performs a fourth process of performing track defect processing on cylinders within the predetermined distance .

  As described above, according to the present invention, the cylinder having the mechanical skew “0” is separated from the disk ID into the cylinder direction having the skew “0” and the OD from the cylinder having the skew “0”. Servo information is recorded in a direction in which the gap erase field does not affect the adjacent cylinder, and servo information inspection is executed in accordance with the servo information, and the track of the cylinder within a certain distance from the skew “0” is subjected to defect processing. The effect of minimizing the interference with the adjacent track during recording occurs, the seek error in the cylinder area near the skew “0” can be prevented, and the presence or absence of abnormality in the recorded servo information can be accurately determined.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 2 shows a configuration of the hard disk drive 10 to which each embodiment of the present invention is applied. The drive 10 includes at least one magnetic disk 12 that is rotated by a spindle motor 14. The drive 10 further comprises a transducer 16 positioned to be adjacent to the disk surface 18.

  The converter 16 can reproduce / record information from the rotating disk 12 by sensing and magnetizing the magnetic field of each disk 12. A transducer 16 is typically coupled to each disk surface 18. It should be noted that in this figure, even though illustrated and described as a single transducer 16, it is a separate transducer for magnetizing the disk 12 and a separate reproduction for sensing the magnetic field of the disk 12. It must be understood that it is composed of a converter. This reproducing converter is composed of a magnetoresistive element.

  The converter 16 can be integrated into the slider 20. The slider 20 is constructed to generate an air bearing between the transducer 16 and the disk surface 18. The slider 20 is coupled to the HGA 22. The HGA 22 is attached to an actuator arm 24 having a voice coil 26. The voice coil 26 is positioned adjacent to a magnetic assembly 28 that identifies the VCM 30. The current supplied to the voice coil 26 generates a talk that rotates the actuator arm 24 relative to the bearing assembly 32. The rotation of the actuator arm 24 moves the transducer 16 across the disk surface 18.

  Information is typically stored in an annular track 34 of the disk 12. Each track 34 generally comprises a plurality of sectors. Each sector includes a data field and an identification field. The identification field is composed of gray codes for identifying sectors and tracks (cylinders). The transducer 16 moves across the disk surface 18 to reproduce / record information on other tracks. Note that moving the transducer across another track is generally called a seek routine.

  FIG. 3 shows an electrical system 40 that can control the hard disk drive 10 to which the embodiments of the present invention are applied. The system 40 includes an R / W (Read / Write) channel circuit 44 and a controller 42 coupled to the converter 16 by a preamplifier circuit 46. The controller 42 includes a digital signal processor, a microprocessor, a microcontroller, and the like. The controller 42 supplies a control signal to the R / W channel 44 in order to record / reproduce information on / from the disk 12. Information is typically transmitted from the R / W channel 44 to the host interface circuit 47. The host interface circuit 47 includes a buffer memory and a control circuit that allow the disk drive to interface with a system such as a personal computer.

  The controller 42 is also coupled to a VCM drive circuit 48 that supplies drive current to the voice coil 26. The controller 42 provides control signals to the drive circuit 48 to control the excitation of the VCM and the movement of the converter 16.

  In the reproduction mode, the R / W channel circuit 44 converts the analog signal reproduced from the converter 16 and amplified by the preamplifier circuit 46 into a digital signal that can be read by the host computer (not shown), and the host interface circuit 47 In the recording mode, user data is received from the host computer through the host interface circuit 47, converted into a recording current that can be recorded on the disk, and signal processed so as to be output to the preamplifier circuit 4.

  The controller 42 is coupled to a read only memory (ROM) or a non-volatile memory such as a flash memory device 50 and a random access memory (RAM) device 52. Memory elements 50 and 52 contain instructions and data used by controller 42 to perform software routines. One of the software routines is a seek routine for moving the transducer 16 from one track to another track. The seek routine includes a server control routine to ensure that the transducer 16 is moved to the correct track.

  The memory elements 50 and 52 store programs according to flowcharts of servo information recording and inspection methods in the disk drive according to the embodiment of the present invention as shown in FIGS. 4 and 5 described in detail later. .

  As a result, the controller 42 sequentially records servo information from the outer circumference in the outsider area toward the cylinder where the skew is “0”, centering on the cylinder having the mechanical skew “0” at the time of servo information recording, and in the inside area in the inside area. The converter is controlled to sequentially record servo information in the cylinder direction where the skew is “0”. That is, after the servo information is sequentially recorded from the cylinder having the smallest number to the cylinder having the skew “0”, the converter is controlled so that the servo information is sequentially recorded from the cylinder having the largest number to the cylinder having the skew “0”.

  In addition, after recording servo information in the cylinder, the controller 42 checks the servo information recorded in the cylinder, and if an error occurs in the cylinder at a predetermined distance from the cylinder having the skew “0”, the servo information The recording process is executed again, and if not, control is performed so that the cylinder in which an error has occurred and the cylinder within a predetermined distance from the cylinder having the skew “0” are subjected to defect processing.

  Next, an embodiment of a servo information recording / inspection method in a disk drive according to the present invention will be described with reference to the flowchart of FIG.

  If the servo information recording mode is executed, the controller 42 controls the VCM 30 to move the head (converter) to the cylinder with the smallest number (“0”) (step 401).

  Then, servo information is recorded while sequentially increasing the cylinder number in the direction of the cylinder having the skew “0” from the cylinder having the smallest number (“0”) of the disk OD (step 402).

  While sequentially recording the servo information from the OD in the direction of skew “0”, it is determined whether or not the current cylinder in which the head is located has reached the cylinder of skew “0 + 1” (step 403). This is to determine whether or not servo information recording has been completed from the cylinder number “0” of the OD to the cylinder having the skew “0”.

  If the result of determination in step 403 is that the head has not reached the cylinder with the skew “0 + 1”, feedback is made to step 402 and servo information continues to be recorded while the cylinders are sequentially raised.

  If the head has reached the cylinder with the skew “0 + 1”, the head is moved to the cylinder with the last number (maximum number) of the disk ID (step 404).

  Then, servo information is recorded while lowering the cylinder number in the direction of skew “0” from the cylinder maximum number of ID (step 405).

  While recording the servo information from the ID in the direction of skew “0”, it is determined whether or not the current cylinder position has reached the cylinder of skew “0” (step 406). This is to determine whether or not servo information recording has been completed from the cylinder with the largest ID number to the cylinder with the skew “0 + 1”.

  If the result of determination in step 406 is that the head has not reached the cylinder with skew “0”, feedback is made to step 405, and servo information is continuously recorded while the cylinder number is sequentially decreased.

  If the head has reached the cylinder having the skew “0”, the servo information is recorded in every cylinder, and the servo information recording is terminated (step 407).

  By the method described above, servo information is sequentially recorded from the cylinder with the smallest number to the cylinder with the skew “0”, and then the head is moved to the cylinder number with the largest number. Then, servo information is sequentially recorded from the cylinder with the largest number to the cylinder with the skew “0”, and the influence of adjacent cylinders due to the gap erase field can be minimized.

  In the flowchart of FIG. 4, servo information is first recorded from the OD to the cylinder direction having the skew “0”, and then the servo information is recorded from the ID to the cylinder direction having the skew “0”. First, servo information is recorded in the cylinder direction where the skew is “0” from the beginning, and then the previous servo information is recorded in the cylinder direction where the skew is “0” from the OD.

  As described above, servo information is recorded in opposite directions from the OD to the cylinder direction of the skew “0” and from the ID to the cylinder direction of the skew “0” around the cylinder having the skew “0”. Depending on the accuracy of the disk drive control, as shown in FIG. 6, there is a possibility that servo information may be superimposed and recorded on some cylinders, centering on the cylinder having the skew “0”.

  In order to prevent a quality problem due to superposition recording in some cylinders as described above, a cylinder inspection process as shown in FIG. 5 is performed.

  Before performing the cylinder inspection, servo information is recorded in the cylinder by the method according to the flowchart of FIG. 4 (step 501).

  After the servo information recording is completed, the head is moved to the cylinder number “0” (step 502).

  Then, it is inspected whether there is an abnormality in the recorded servo information while increasing the cylinder number (step 503). Whether there is an abnormality in the servo information recorded in the cylinder is determined based on whether the gray information, servo sector information, and burst information are normal (step 504).

  If there is an abnormality in the servo information recorded as a result of the inspection in step 503, whether or not the cylinder in which the abnormality has occurred corresponds to a cylinder (X or Y) located at a fixed distance from the cylinder indicating the skew “0”. Judgment is made (step 505). Here, the fixed distance is determined in consideration of the accuracy of the disk drive. In particular, it is determined in consideration of the accuracy of the push pin that moves the head. If a servo information error occurs in the X or Y cylinder in step 505, this corresponds to a case where overwriting is performed excessively. Therefore, the servo information recording is performed again according to the flowchart of FIG. I do.

  If the determination result in step 505 is not an X or Y cylinder, track defect processing is performed on the cylinder in which the servo information error has occurred (step 506).

  If there is no abnormality in the servo information in the corresponding cylinder as a result of determination in step 504, the cylinder number is increased (step 507).

  After the servo information inspection is completed up to the last cylinder, track defect processing is performed on the cylinders X to Y (steps 508 and 509). This is because if the overwrite area exists, the cylinder information increases nonlinearly, and a large error occurs between the cylinder estimated by the servo controller and the cylinder currently located during a seek operation at a short distance from the overwrite area. This is to prevent a normal seek operation from being performed. That is, if a seek operation is performed over a certain distance, an appropriate distance X and Y are selected and track defect processing is performed so that a margin time for compensating for an error between the estimated cylinder and the current cylinder can be provided.

  At this time, if the processed track defect is located in the same data zone, it is difficult to balance with other data zones such as BPI. Therefore, the cylinder having the skew “0” is located at the boundary of the data zone, and the track defect is set to two data zones. It is effective to perform distributed management in zones.

  If an error occurs in the servo information recorded in the cylinder at a fixed distance from the cylinder with skew “0” as a result of the servo information inspection as described above, it corresponds to the case where the re-recording cylinder area exceeds the design standard. Therefore, if the servo track write is executed again and there is no abnormality in the servo information recorded in the cylinder at a fixed distance from the cylinder with the skew “0”, the servo track write is fixed from the cylinder with the skew “0”. Track defect processing for cylinders within the distance.

  As mentioned above, although preferred embodiment of this invention was described referring an accompanying drawing, it cannot be overemphasized that this invention is not limited to the example which concerns. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the claims, and these are naturally within the technical scope of the present invention. Understood.

  For example, the present invention can be implemented as a method, apparatus, and system, in which case the constituent means of the present invention are code segments that inevitably perform the necessary work when executed in software. The program or code segment can be stored in a processor readable medium or transmitted by a computer data signal combined with a carrier wave in a transmission medium or communication network.

  Processor-readable media also includes any media that can store or transmit information. Examples of the processor-readable medium include an electronic circuit, a semiconductor memory device, a ROM, a flash memory, an erasable ROM, a floppy (registered trademark) disk, an optical disk, a hard disk, an optical fiber medium, and a radio frequency (RF) network. Computer data signals include any signal that can propagate over a transmission medium such as an electronic network channel, optical fiber, air, electronic system, RF network, and the like.

  The present invention can be applied to a disk drive control method and its apparatus, and in particular, servo information is recorded while minimizing the influence on the servo information recorded in the adjacent cylinder by the gap erase field in the disk drive, and correspondingly. The present invention can be applied to a servo information recording / inspection method and apparatus for a disk drive for performing servo information inspection and defect processing.

(A) And (b) is a figure for demonstrating the influence of an adjacent cylinder by a gap erase field at the time of servo information recording. 1 is a plan view of a configuration of a hard disk drive to which the present invention is applied. 1 is a circuit diagram of an electrical system that controls a hard disk drive. FIG. 5 is a flowchart of a servo information recording / inspecting method in a disk drive according to an embodiment of the present invention. 6 is a flowchart of a servo information recording / inspection method in a disk drive according to another embodiment of the present invention. It is the figure which showed the recording state of the cylinder at the time of applying the servo information recording / inspection method with the disk drive by one embodiment of this invention.

Explanation of symbols

10 drive 12 disk 14 spindle motor 16 converter 18 disk surface 20 slider 22 HGA
24 Actuator arm 26 Voice coil 28 Magnetic assembly 30 VCM
32 Bearing assembly 34 Annular track

Claims (10)

Servo information recording / inspection method in a disk drive,
Servo information is sequentially recorded in the direction of the cylinder with the skew “0” from the outer periphery in the outsider area centering on the cylinder with the skew “0”, and in the insider area, the servo information of the cylinder with the skew “0” from the inner periphery is recorded. A recording process for sequentially recording servo information in the direction;
Predetermined distance is a distance determined based on the accuracy of the push pins for moving at least head, after finishing the recording of the servo information by the recording step, from the having skew '0' cylinder to said predetermined distance An inspection process for inspecting the servo information recorded in the cylinder and determining whether the servo information recording state is normal ;
If an error occurs in the inspection result of the servo information recorded in the cylinder at the predetermined distance from the cylinder having the skew “0”, the servo information is recorded again by feeding back to the recording process, and no error has occurred. In this case , the servo information recording / inspection method in the disk drive includes a processing step of performing track defect processing on the cylinder within the predetermined distance from the cylinder having the skew of “0” . 2. The servo information recording / inspection method for a disk drive according to claim 1 , wherein the cylinder having the skew "0" is positioned at a boundary of the data zone and the track defect is distributed to the two data zones. Servo information recording / inspection method in a disk drive,
One recording step of sequentially recording servo information from the cylinder with the smallest number to the cylinder with skew “0”;
A movement step of moving the head to the cylinder with the largest number after recording up to the cylinder having the skew “0”;
Another recording step of sequentially recording servo information from the cylinder with the largest number to the cylinder with the skew “0”;
Predetermined distance is a distance determined based on the accuracy of the push pins for moving at least the head, after executing the other recording step are recorded from the having skew '0' cylinder to the cylinder in the predetermined distance An inspection process for inspecting the servo information and determining whether the servo information recording state is normal ,
If an inspection result error occurs in the servo information recorded in the cylinder at the predetermined distance from the cylinder having the skew “0” in the inspection process, the servo information is recorded again by feeding back to one recording process. A servo information recording / inspection method in a disk drive, comprising: a process of performing track defect processing on a cylinder within the predetermined distance from a cylinder having the skew of “0” . 4. The servo information recording / inspection method for a disk drive according to claim 3 , wherein the cylinder having the skew "0" is positioned at a boundary between data zones, and track defects are distributed to two data zones. Servo information recording / inspection method in a disk drive,
A recording process for recording servo information in a cylinder;
An inspection step of inspecting the servo information recorded in the cylinder while increasing the cylinder number;
The predetermined distance is a distance that is determined based on at least the accuracy of the push pin that moves the head. When an error occurs as a result of the inspection of the servo information, the cylinder number in which the error has occurred has a skew of “0”. a determination step of determining whether corresponds to the cylinder in the predetermined distance from the cylinder,
If the cylinder number judgment result error of the determination step has occurred corresponds from the cylinder having skew '0' in the cylinder at the predetermined distance is fed back to the recording step to newly recorded servo information, so If not, a feedback step of feeding back the cylinder in which the error has occurred to the inspection step after the track defect processing,
At the inspection step, when the cylinder examined the servo information corresponds to the maximum number cylinders, that from said having skew '0' cylinder and a processing step of processing the track defect cylinder within the predetermined distance Servo information recording / inspection method for disk drives The recording process includes:
Servo information is recorded sequentially from the outer periphery to the cylinder with the skew “0” in the outsider area centered on the cylinder with the skew “0”, and in the insider area, the servo information is transferred from the inner periphery to the cylinder with the skew “0”. 6. The servo information recording / inspecting method for a disk drive according to claim 5 , wherein: The recording process includes:
Sequentially recording the servo information from the smallest numbered cylinder to the cylinder with skew “0”;
Recording to the cylinder with the skew “0” and then moving the head to the highest numbered cylinder;
6. The servo information recording / inspection method for a disk drive according to claim 5 , further comprising the step of recording servo information sequentially from the cylinder with the largest number to the cylinder having the skew of “0”. 6. The servo information recording / inspecting method for a disk drive according to claim 5 , wherein the cylinder having the skew "0" is positioned at a boundary between data zones, and track defects are distributed to two data zones. A disk drive to which a servo information recording / inspection method is applied,
A disk having a surface;
A spindle motor for rotating the disk;
A converter capable of recording / reproducing information on the disc;
A voice coil motor for moving the transducer;
The voice coil motor is controlled to record servo information sequentially from the outer periphery to the cylinder with the skew “0” in the outsider area centering on the cylinder with the skew “0” when servo information is recorded. The converter is controlled to sequentially record servo information in the cylinder direction where the skew is “0”, and after the servo information is recorded, it is recorded in a cylinder at a predetermined distance from the cylinder where the skew is “0”. A controller that performs a process of checking the servo information and determining whether the servo information recording state is normal ,
The predetermined distance is a distance determined based on at least the accuracy of a push pin that moves the head,
The controller
A first process for inspecting the servo information recorded in the cylinder while increasing the cylinder number after recording the servo information in the cylinder;
When an error occurs as a result of the servo information inspection in the first process, it is determined whether or not the cylinder in which the error occurred corresponds to a cylinder at the predetermined distance from a cylinder having a skew of “0”. When,
Servo information is newly recorded when the cylinder number in which the error has occurred in the second process corresponds to the cylinder at the predetermined distance from the cylinder having the skew “0”, otherwise the error is indicated. A third process that feeds back to the first process after track defect processing of the resulting cylinder;
When a cylinder whose servo information has been inspected in the first process corresponds to a maximum number cylinder, a fourth process of performing track defect processing on a cylinder within the predetermined distance from the cylinder having the skew “0” is performed. And a disk drive. The disk drive according to claim 9 , wherein the cylinder having the skew “0” is located at a boundary of the data zone, and the track defect is distributed to the two data zones.

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